EP2228222B1 - Image forming device - Google Patents
Image forming device Download PDFInfo
- Publication number
- EP2228222B1 EP2228222B1 EP10002253A EP10002253A EP2228222B1 EP 2228222 B1 EP2228222 B1 EP 2228222B1 EP 10002253 A EP10002253 A EP 10002253A EP 10002253 A EP10002253 A EP 10002253A EP 2228222 B1 EP2228222 B1 EP 2228222B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- droplet ejection
- blocking member
- air
- image forming
- air blowing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangementsĀ of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangementsĀ of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0022—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using convection means, e.g. by using a fan for blowing or sucking air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangementsĀ of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangementsĀ of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves
Definitions
- the present invention relates to an image forming device.
- the paper P may be heated, or heated air may be blown thereon, or the like.
- paper P may be suctioned at a heated stage and heated air may be blown thereon immediately following drawing of the image.
- JP-A Japanese Patent Application Laid-Open (JP-A) No. 2002-347226 discloses a configuration of an inkjet printer that uses an ink drying method in which the back of a paper P is heated at a paper P conveyance direction upstream position and a paper P conveyance direction downstream position with respect to a line inkjet head, and a recording surface is heated and dried in a non-contact manner at a downstream position with respect to the line inkjet head.
- JP-A No. 8-323977 a configuration of an inkjet printer is disclosed in JP-A No. 8-323977 in which a drum that holds and conveys paper P is a heated drum.
- JP-A No. 2002-347226 when the ink is dried immediately following ink ejection in order to improve ink drying performance, it is necessary to move a drying unit close to an ink ejection unit.
- heat or heated air generated by the drying may reach an ejection surface of the inkjet head, and ink may dry at a nozzle, or a temperature at the nozzle head may increase, which may result in problems such as unstable ink ejection characteristics.
- JP-A No. 8-323977 heat or heated air is transmitted to an inkjet head, and as a result, when the temperature of a heated drum is increased in order to improve ink drying performance, problems may occur such as a decrease in stability of ink ejection characteristics at a time of ink droplet ejection.
- EP 0 423 820 A2 relates to an ink jet printer having a sheet conveying mechanism which changes the speed of conveyance of a recording sheet in accordance with the density of characters or a pattern to be printed to intermittently convey the recording sheet in such a manner that all printed portions are properly dried before the sheet is conveyed to a subsequent position.
- JP 2003/211652 relates to an inkjet printer which is supposed to be able to prevent wrinkles and warps of a cloth whilst having a simple constitution and which is also reported to be able to print high quality images without requiring a frequent maintenance work.
- JP 11-179889 relates to an ink jet recorder in which ink is reported to be dried quickly and surely without increasing the size of the recorder.
- the present invention provides an image forming device that can perform ink droplet drying while suppressing negative effects on the stability of ink droplet ejection characteristics.
- a first aspect of the present invention is an image forming device, including: a conveyance stage that holds a recording medium at a holding surface and conveys the recording medium; a droplet ejection head provided opposing the holding surface; a first air blowing device that blows air along a droplet ejection direction of the droplet ejection head, and a second air blowing device, provided further to a conveyance direction downstream side than the droplet ejection head and opposing the holding surface, that blows heated air.
- the image forming device when air blown from a second air blowing device dries ink droplets ejected onto a recording medium, air blown from a first air blowing device along an droplet ejection direction pushes back air blown from the second air blowing device; thereby it is possible to prevent negative effects on an ejection surface of an droplet ejection head.
- a first blocking member that extends along a droplet ejection direction is provided at a downstream side of the droplet ejection head in a conveyance direction, such that the blocking member blocks an area between the droplet ejection head and the second air blowing device.
- the first blocking member blocks an area between the droplet ejection head and the second air blowing device, it is possible to prevent negative effects of air blown from the second air blowing device on an ejection surface of the droplet ejection head.
- the image forming device is provided with a second blocking member disposed along a droplet ejection direction at an upstream side of the droplet ejection head in a conveyance direction.
- the space between the first blocking member and the holding surface is larger than the space between the second blocking member and the holding surface and/or the operation of the first air blowing device is controlled such that the air pressure at a space near to the holding surface and between the first blocking member and the second blocking member has a positive pressure with respect to an outside of the space.
- the first air blowing device may be provided between the droplet ejection head and the first blocking member.
- air pressure in the vicinity of the droplet ejection head can be further increased, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- the first air blowing device may be provided between the droplet ejection head and the second blocking member.
- air pressure in the vicinity of the droplet ejection head can be further increased, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- the image forming device may include plural droplet ejection heads arranged along a conveyance direction, with at least one first air blowing device disposed between the droplet ejection heads.
- the image forming device may include plural first air blowing devices, in which one first air blowing device provided at a downstream side has a larger blowing strength than another first air blowing device provided at an upstream side.
- air pressure in the vicinity of a droplet ejection head can be further increased at an upstream side, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- the stage may include a roller provided with a heating member that heats the holding surface.
- the recording medium may be heated from the stage side, and air blown from a first air blowing device may prevent negative effects on an ejection surface, while drying the liquid droplets.
- the stage may be provided with a cover member that covers a recessed portion of an outer peripheral surface of the stage.
- the present invention has the above configuration, it is possible to provide an image forming device that can perform ink droplet drying while suppressing negative effects on the stability of ink ejection performance.
- image forming device 10 is provided with a paper supply and conveyance section 12, that supplies and conveys a paper P, which is a recording medium, at an upstream side in a conveyance direction of paper P.
- a processing liquid application section 14 that applies a processing liquid to a recording surface of paper P
- an image formation section 16 that forms an image on a recording surface of paper P
- an image fixing section 20 that fixes a dried image to paper P
- an ejection section 21 that ejects paper P to which the image has been fixed.
- Paper supply and conveyance section 12 includes a stacking section 22 at which paper P is stacked, and, at a paper conveyance direction downstream side of stacking section 22, a paper supply section 24 that supplies paper P stacked at stacking section 22 one sheet at a time. Paper P supplied by paper supply section 24 is conveyed by a conveyance section 28 provided with plural pairs of rollers 26 to processing liquid application section 14.
- a processing liquid application drum 30 is rotatably provided at processing liquid application section 14.
- a holding member 32 that holds paper P by gripping a leading end portion of paper P is provided at processing liquid application drum 30. Paper P is held at a surface of processing liquid application drum 30 by holding member 32 and in this state is conveyed in a downstream direction by the rotation of processing liquid application drum 30.
- An intermediate conveyance drum 34 explained below, as well as an image formation drum 36 and an image fixing drum 40 are also provided with a holding member 32 similar to processing liquid application drum 30. Paper P is passed from the upstream drums to the downstream drums by holding members 32.
- processing liquid application drum 30 At an upper portion of processing liquid application drum 30, along a peripheral direction of processing liquid application drum 30, is provided a processing liquid application device 42 and a processing liquid drying device 44. Processing liquid is applied to a recording surface of paper P by processing liquid application device 42, and the processing liquid is dried by processing liquid drying device 44.
- the processing liquid reacts with the ink and causes the colorant (pigment) to aggregate, thereby promoting the separation of the colorant (pigment) and a solvent.
- a rubber roller 50 is provided at and presses against gravier roller 48. Rubber roller 50 contacts a recording surface (face) side of paper P and processing liquid is thereby applied. A squeegee (not shown) contacts gravier roller 48 and controls the application amount of processing liquid applied to the recording surface of paper P.
- processing liquid drying device 44 At processing liquid drying device 44 is provided a heated air nozzle 54 and an infrared heater 56 (hereinafter also referred to as "IR heater 56") near to the surface of processing liquid application drum 30. Processing liquid is applied to the recording surface at processing liquid application section 14, and paper P is dried, and then conveyed to an intermediate conveyance section 58 provided between processing liquid application section 14 and image formation section 16.
- IR heater 56 an infrared heater 56
- Intermediate conveyance drum 34 is rotatably provided at intermediate conveyance section 58, and an edge portion of paper P is held at a surface of intermediate conveyance drum 34 by a holding member 32 provided at intermediate conveyance drum 34. Paper P is conveyed downstream by the rotation of intermediate conveyance drum 34.
- Image formation drum 36 is rotatably provided at image formation section 16, and paper P is held at a surface of image formation drum 36 by a holding member 32 provided at image formation drum 36. Paper P is conveyed downstream by the rotation of image formation drum 36.
- a head unit 66 including a single pulse inkjet line head 64 near to an outer peripheral surface of image formation drum 36.
- inkjet line head 64 having at least the basic colors YMCK, is arranged along a peripheral direction of image formation drum 36, such that an image of various colored droplets may be formed on paper P.
- a heater 37 is provided at a separate location opposing the outer peripheral surface of image formation drum 36. Heater 37 heats image formation drum 36 from an outer side, and, as indicated by arrow H, the temperature of image formation drum 36 itself increases, and paper P is thereby maintained at a specific temperature or greater while being held at the outer peripheral surface, such that the water content of paper P may be controlled.
- Inkjet line head 64 performs droplet ejection synchronized with an encoder (not shown) that is provided at image formation drum 36 and that detects a rotation speed. Thereby, it is possible to determine droplet impact position with high accuracy, and to reduce inconsistencies in droplet ejection regardless of the movement of image formation drum 36, the accuracy of a rotation axle 68 or a drum surface speed.
- Head unit 66 can be retracted from an upper portion of image formation drum 36, and operations of cleaning a nozzle surface of inkjet line head 64 and discharging viscous ink may be performed by retracting head unit 66 from an upper portion of image formation drum 36.
- Paper P having an image formed at a recording surface thereof, is conveyed by the rotation of image formation drum 36 to an intermediate conveyance section 70 provided between image formation section 16 and ink drying section 18. Since the configuration of intermediate conveyance section 70 is substantially similar to that of intermediate conveyance section 58, description thereof is omitted here.
- the temperature of the heated air may vary according to the conveyance speed of paper P, but it is generally set to from around 50Ā°C to around 70Ā°C.
- Evaporated solvent may be discharged together with air from an outer portion of image forming device 10, or the air may be collected, and the air including evaporated solvent may be cooled by a cooling device or the like, and the solvent may be condensed and collected in a liquid state by a radiator or the like.
- Paper P having an image formed at a recording surface thereof, is conveyed to image fixing section 20 by the rotation of intermediate conveyance drum 34.
- Image fixing drum 40 is rotatably provided at image fixing section 20.
- Image fixing section 20 has a function whereby it imparts heat and pressure to latex particles in the thin film image layer formed on paper P such that the latex particles are melted and thereby fixed on paper P.
- Heat roller 78 includes a halogen lamp inside a metal tube made of a material with good heat conductivity, such as aluminum. Heat energy at or above a temperature Tg (melting temperature) of the latex is applied by heat roller 78. As a result, the latex particles melt, and are pressed and fixed into surface irregularities on paper P; thereby, irregularities at an image surface may be smoothed, and glossiness may be improved.
- Tg melting temperature
- Fixing roller 80 is provided to push against a surface of image fixing drum 40, such that a nipping force may be obtained between fixing roller 80 and image fixing drum 40.
- a surface of at least one of fixing roller 80 or image fixing drum 40 has elasticity, and is configured to have a uniform nip width with respect to paper P.
- paper P having an image fixed at a recording surface thereof is conveyed by the rotation of image fixing drum 40 to an ejection section 21 provided at a downstream side of image fixing section 20.
- image fixing section 20 has been described. However, a configuration in which an image formed at a recording surface is dried and fixed at dryer 38 is also possible, and image fixing section 20 is not essential.
- the image forming device as shown enlarged in Figs. 2 and 3 , is provided with a structure around a dryer and head unit.
- head unit 66 is provided with a blocking member 92 at a conveyance direction upstream side, and a blocking member 90 at a conveyance direction downstream side.
- Blocking member 92 and blocking member 90 are each provided radially extending from an area near an outer peripheral surface of image formation drum 36 that holds conveys paper P.
- Blocking member 92 and blocking member 90 each extend in a width direction of paper P, and respectively cover head unit 66 at both conveyance direction sides thereof.
- a fan 94A Between blocking member 92 and an inkjet line head 64M which is farthest towards a conveyance direction upstream side is provided a fan 94A.
- Fan 94A blows air along a droplet ejection direction towards an area near an outer peripheral surface of image formation drum 36, such that heat from image formation drum 36 is not readily transferred to a distal end in an ejection direction of inkjet line head 64M.
- a distal end in an ejection direction of inkjet line head 64M may be provided with a temperature sensor 96A.
- a temperature sensed at temperature sensor 96A may be sent as temperature data to a control section (not shown), and based on the temperature data, the control section may control fan 94A to be ON or OFF such that a temperature at an area near a distal end in an ejection direction of inkjet line head 64M does not exceed a predetermined temperature.
- a fan 94B is provided at a conveyance direction downstream side of inkjet line head 64M, and blows air in the direction of arrow 94F2, along a liquid droplet ejection direction towards a vicinity of an outer peripheral surface of image formation drum 36.
- This configuration is such that heat from image formation drum 36 is not readily transmitted to a distal end in an ejection direction of inkjet line head 64M and inkjet line head 64K, which is adjacent thereto on a conveyance direction downstream side thereof.
- a distal end in an ejection direction of inkjet line head 64K may be provided with a temperature sensor 96B similar to inkjet line head 64M. Based on temperature data obtained by temperature sensor 96B, a control section (not shown) may control fan 94B to be ON or OFF such that a temperature at an area near a distal end in an ejection direction of inkjet line head 64K does not exceed a predetermined temperature.
- a configuration may be adopted in which, for example, temperature data is compared with temperature data from the adjacent temperature sensor 96A, and fan 94B is controlled taking into account the overall temperature of head unit 66.
- inkjet line head 64K and inkjet line head 64C which is adjacent thereto at a conveyance direction downstream side is provided a fan 94C
- inkjet line head 64C and inkjet line head 64Y which is adjacent thereto at a conveyance direction downstream side is provided a fan 94D.
- a fan 94E that blows air in the direction of arrow 94F5, along a liquid droplet ejection direction towards a vicinity of an outer peripheral surface of image formation drum 36.
- blocking member 90 At a conveyance direction downstream side of fan 94E is provided blocking member 90. Similar to blocking member 92, blocking member 90 is provided radially extending from an area near an outer peripheral surface of image formation drum 36, and extends across a width direction of paper P, and covers head unit 66 at a conveyance direction downstream side thereof.
- An end of blocking member 90 at a side near image formation drum 36 is separated from an outer peripheral surface of image formation drum 36 only by distance 90d.
- This distance may be substantially the same as distance 92d from blocking member 92 to the outer peripheral surface of image formation drum 36, or distance 92d may be smaller than distance 90d (92d ā 90d).
- distance 92d is smaller than distance 90d, air readily passes in the direction of arrow 90F, between image formation drum 36 and blocking member 90, which is further downstream than blocking member 92, which is at a conveyance direction upstream side. Thereby, heat from dryer 38, described below, can be effectively blocked from head unit 66.
- a dryer 38 including nozzle 72 and fan heater 74. Air blown by nozzle 72 in the direction of arrow 38F flows along an outer peripheral surface of image formation drum 36, and a part thereof passes through a gap (90d) between blocking member 90 and the outer peripheral surface of image formation drum 36 and blows towards a head unit 66 side.
- a control section (not shown) operates fans 94A to 94E, thereby applying a positive pressure to the gap between blocking member 90 and blocking member 92 that is greater than that of the surrounding area, and blows out air in the direction of arrow 90F.
- control is performed such that air carrying heat from dryer 38 does not enter the head unit 66 side.
- Dryer 38 may be a blowing device similar to fans 94A to 94E, instead of fan heater 74. In this case, air heated by the heated image formation drum 36 may be prevented from blowing to a head unit 66 side through a gap (90d) between blocking member 90 and an outer peripheral surface of image formation drum 36.
- the above described fans 94A to 94E may all be the same type of fan and blow the same amount of air, or different amounts of air may be respectively blown thereby; for example, the amount of air blown may increase from a conveyance direction upstream side to a conveyance direction downstream side.
- holding member 32 that holds paper P by gripping a leading end portion of paper P, and paper P is conveyed towards a downstream side via holding member 32.
- Holding member 32 is provided with a recessed portion 32A provided at an outer peripheral surface of image formation drum 36, and a cover 33 that covers recessed portion 32A and forms an integrated surface with image formation drum 36. Due to cover 33 sealing recessed portion 32A, recessed portion 32A is prevented from holding and retaining air which has been heated by image formation drum 36, whereby heat may be prevented from being transmitted to an area in the vicinity of head unit 66.
- the overall configuration of the image forming device of the present invention according to the present embodiment may be comparatively small, compared to a case in which the present configuration is not adopted.
- a conventional image forming device 100 as shown in Fig. 4A provides a separate device as a section corresponding to dryer 38 in the present embodiment of the present invention (see arrow 102), and as a result the size thereof in the conveyance direction increases to the length shown by arrow 102.
- paper P is held at a surface of a drum and conveyed.
- the present invention is not limited to this embodiment, and, for example, a configuration that uses an endless belt as a conveyer belt, or a configuration in which a paper is conveyed using a flat plate-like stage, may be used in the present invention.
- paper P is coated with processing liquid by processing liquid application section 14, and following a drying process, droplet ejection is performed with respect to paper P by head unit 66.
- the present invention is not limited to this embodiment, and, for example, a standard ink jet printer may be used in the present invention, in which plain paper is held and conveyed as is, and droplets are directly ejected to the surface thereof, thereby forming an image.
- the ejected liquid of the present invention is also not limited to ink, and may, for example, be used to form substrate patterns during etching.
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Abstract
Description
- The present invention relates to an image forming device.
- Conventionally, when printing aqueous ink on a general-use paper P with an inkjet recording device, in order to prevent water in the ink from permeating into a base sheet of paper P in order to create a high quality image, it has been necessary to dry a printing surface instantly.
- As general methods of drying the printing surface, the paper P may be heated, or heated air may be blown thereon, or the like. In order to perform drying soon after drawing an image, paper P may be suctioned at a heated stage and heated air may be blown thereon immediately following drawing of the image.
- As an example of such a method, Japanese Patent Application Laid-Open (JP-A) No.
2002-347226 - Further, a configuration of an inkjet printer is disclosed in
JP-A No. 8-323977 - However, in the configuration of
JP-A No. 2002-347226 - As a result, heat or heated air generated by the drying may reach an ejection surface of the inkjet head, and ink may dry at a nozzle, or a temperature at the nozzle head may increase, which may result in problems such as unstable ink ejection characteristics.
- Similarly, in the configuration of
JP-A No. 8-323977 -
EP 0 423 820 A2 relates to an ink jet printer having a sheet conveying mechanism which changes the speed of conveyance of a recording sheet in accordance with the density of characters or a pattern to be printed to intermittently convey the recording sheet in such a manner that all printed portions are properly dried before the sheet is conveyed to a subsequent position. -
JP 2003/211652 -
JP 11-179889 - In consideration of the above issues, the present invention provides an image forming device that can perform ink droplet drying while suppressing negative effects on the stability of ink droplet ejection characteristics.
- A first aspect of the present invention is an image forming device, including: a conveyance stage that holds a recording medium at a holding surface and conveys the recording medium; a droplet ejection head provided opposing the holding surface; a first air blowing device that blows air along a droplet ejection direction of the droplet ejection head, and a second air blowing device, provided further to a conveyance direction downstream side than the droplet ejection head and opposing the holding surface, that blows heated air.
- In the image forming device according to the first aspect of the present invention, when air blown from a second air blowing device dries ink droplets ejected onto a recording medium, air blown from a first air blowing device along an droplet ejection direction pushes back air blown from the second air blowing device; thereby it is possible to prevent negative effects on an ejection surface of an droplet ejection head.
- In the first aspect of the present invention, a first blocking member that extends along a droplet ejection direction is provided at a downstream side of the droplet ejection head in a conveyance direction, such that the blocking member blocks an area between the droplet ejection head and the second air blowing device.
- In the above configuration, since the first blocking member blocks an area between the droplet ejection head and the second air blowing device, it is possible to prevent negative effects of air blown from the second air blowing device on an ejection surface of the droplet ejection head.
- The image forming device according to the first aspect of the present invention is provided with a second blocking member disposed along a droplet ejection direction at an upstream side of the droplet ejection head in a conveyance direction.
- In the above configuration, since an upstream side of the droplet ejection head in a conveyance direction is blocked by the second blocking member, the vicinity of the droplet ejection head can be blocked by the first and second blocking members, thereby creating a positive pressure with respect to a surrounding area. As a result, it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- In the image forming device according to the first aspect of the present invention, the space between the first blocking member and the holding surface is larger than the space between the second blocking member and the holding surface and/or the operation of the first air blowing device is controlled such that the air pressure at a space near to the holding surface and between the first blocking member and the second blocking member has a positive pressure with respect to an outside of the space.
- By the above configuration, it is possible to further increase the air pressure in a vicinity of a droplet ejection head at an upstream side in a conveyance direction, by decreasing the distance from a blocking member to the holding surface at an upstream side in a conveyance direction and increasing the distance from a blocking member to the holding surface at a downstream side. As a result, it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- In the image forming device according to the first aspect of the present invention, the first air blowing device may be provided between the droplet ejection head and the first blocking member.
- In the above configuration, air pressure in the vicinity of the droplet ejection head can be further increased, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- In the image forming device according to the first aspect of the present invention, the first air blowing device may be provided between the droplet ejection head and the second blocking member.
- In the above configuration, air pressure in the vicinity of the droplet ejection head can be further increased, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- The image forming device according to the first aspect of the present invention may include plural droplet ejection heads arranged along a conveyance direction, with at least one first air blowing device disposed between the droplet ejection heads.
- In the above configuration, it is possible to further increase air pressure in the vicinity of plural droplet ejection heads in an image forming device provided with plural droplet ejection heads, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- The image forming device according to the first aspect of the present invention may include plural first air blowing devices, in which one first air blowing device provided at a downstream side has a larger blowing strength than another first air blowing device provided at an upstream side.
- In the above configuration, air pressure in the vicinity of a droplet ejection head can be further increased at an upstream side, and as a result it is possible to prevent negative effects on an ejection surface by air blown from a second air blowing device.
- In the image forming device according to the first aspect of the present invention, the stage may include a roller provided with a heating member that heats the holding surface.
- In the above configuration, by using a roller provided with a heating member as the stage, the recording medium may be heated from the stage side, and air blown from a first air blowing device may prevent negative effects on an ejection surface, while drying the liquid droplets.
- In the image forming device according to the first aspect of the present invention, the stage may be provided with a cover member that covers a recessed portion of an outer peripheral surface of the stage.
- In the above configuration, since a recessed portion of an outer peripheral surface of the stage is covered by a cover member, it is possible to prevent heated air at the recessed portion from being retained, thereby preventing negative effects on a droplet ejection head by heat from the stage.
- Since the present invention has the above configuration, it is possible to provide an image forming device that can perform ink droplet drying while suppressing negative effects on the stability of ink ejection performance.
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Fig. 1 is a schematic view showing the main portions of the image forming device according to an embodiment of the present invention. -
Fig. 2 is a enlarged side view showing the structure of the image forming device shown inFig. 1 . -
Fig. 3 is a enlarged side view showing the structure of the image forming device shown inFig. 2 . -
Figs. 4A and 4B are schematic views showing the overall configuration of two image forming devices;Fig. 4A shows an example of a conventional image forming device, andFig. 4B shows the image forming device according to an embodiment of the present invention. - Next, an exemplary embodiment of the present invention will be explained with reference to the drawings.
- As shown in
Fig. 1 ,image forming device 10 according to the present embodiment is provided with a paper supply andconveyance section 12, that supplies and conveys a paper P, which is a recording medium, at an upstream side in a conveyance direction of paper P. At a downstream side of paper supply andconveyance section 12, are provided, in the following order in a conveyance direction of paper P, a processingliquid application section 14 that applies a processing liquid to a recording surface of paper P, animage formation section 16 that forms an image on a recording surface of paper P, animage fixing section 20 that fixes a dried image to paper P, and anejection section 21 that ejects paper P to which the image has been fixed. Each of these processing sections is explained below. - Paper supply and
conveyance section 12 includes astacking section 22 at which paper P is stacked, and, at a paper conveyance direction downstream side ofstacking section 22, apaper supply section 24 that supplies paper P stacked atstacking section 22 one sheet at a time. Paper P supplied bypaper supply section 24 is conveyed by aconveyance section 28 provided with plural pairs ofrollers 26 to processingliquid application section 14. - A processing
liquid application drum 30 is rotatably provided at processingliquid application section 14. Aholding member 32 that holds paper P by gripping a leading end portion of paper P is provided at processingliquid application drum 30. Paper P is held at a surface of processingliquid application drum 30 by holdingmember 32 and in this state is conveyed in a downstream direction by the rotation of processingliquid application drum 30. - An
intermediate conveyance drum 34 explained below, as well as animage formation drum 36 and animage fixing drum 40 are also provided with aholding member 32 similar to processingliquid application drum 30. Paper P is passed from the upstream drums to the downstream drums by holdingmembers 32. - At an upper portion of processing
liquid application drum 30, along a peripheral direction of processingliquid application drum 30, is provided a processingliquid application device 42 and a processingliquid drying device 44. Processing liquid is applied to a recording surface of paper P by processingliquid application device 42, and the processing liquid is dried by processingliquid drying device 44. - The processing liquid reacts with the ink and causes the colorant (pigment) to aggregate, thereby promoting the separation of the colorant (pigment) and a solvent. At processing
liquid application device 42 is provided areservoir section 46 at which processing liquid is stored, and a gravier roller 48 is partially immersed in processing liquid. - A
rubber roller 50 is provided at and presses against gravier roller 48.Rubber roller 50 contacts a recording surface (face) side of paper P and processing liquid is thereby applied. A squeegee (not shown) contacts gravier roller 48 and controls the application amount of processing liquid applied to the recording surface of paper P. - At processing
liquid drying device 44 is provided aheated air nozzle 54 and an infrared heater 56 (hereinafter also referred to as "IR heater 56") near to the surface of processingliquid application drum 30. Processing liquid is applied to the recording surface at processingliquid application section 14, and paper P is dried, and then conveyed to anintermediate conveyance section 58 provided between processingliquid application section 14 andimage formation section 16. -
Intermediate conveyance drum 34 is rotatably provided atintermediate conveyance section 58, and an edge portion of paper P is held at a surface ofintermediate conveyance drum 34 by a holdingmember 32 provided atintermediate conveyance drum 34. Paper P is conveyed downstream by the rotation ofintermediate conveyance drum 34. -
Image formation drum 36 is rotatably provided atimage formation section 16, and paper P is held at a surface ofimage formation drum 36 by a holdingmember 32 provided atimage formation drum 36. Paper P is conveyed downstream by the rotation ofimage formation drum 36. - At an upper portion of
image formation drum 36, is provided ahead unit 66 including a single pulseinkjet line head 64 near to an outer peripheral surface ofimage formation drum 36. Athead unit 66,inkjet line head 64, having at least the basic colors YMCK, is arranged along a peripheral direction ofimage formation drum 36, such that an image of various colored droplets may be formed on paper P. - A
heater 37 is provided at a separate location opposing the outer peripheral surface ofimage formation drum 36.Heater 37 heatsimage formation drum 36 from an outer side, and, as indicated by arrow H, the temperature ofimage formation drum 36 itself increases, and paper P is thereby maintained at a specific temperature or greater while being held at the outer peripheral surface, such that the water content of paper P may be controlled. -
Inkjet line head 64 performs droplet ejection synchronized with an encoder (not shown) that is provided atimage formation drum 36 and that detects a rotation speed. Thereby, it is possible to determine droplet impact position with high accuracy, and to reduce inconsistencies in droplet ejection regardless of the movement ofimage formation drum 36, the accuracy of arotation axle 68 or a drum surface speed. -
Head unit 66 can be retracted from an upper portion ofimage formation drum 36, and operations of cleaning a nozzle surface ofinkjet line head 64 and discharging viscous ink may be performed by retractinghead unit 66 from an upper portion ofimage formation drum 36. - Paper P, having an image formed at a recording surface thereof, is conveyed by the rotation of
image formation drum 36 to anintermediate conveyance section 70 provided betweenimage formation section 16 and ink drying section 18. Since the configuration ofintermediate conveyance section 70 is substantially similar to that ofintermediate conveyance section 58, description thereof is omitted here. - At a downstream side of
head unit 66, at least onedryer 38 is provided at a location opposing an outer peripheral surface ofimage formation drum 36.Dryer 38 is provided with anozzle 72 and afan heater 74. Heated air fromnozzle 72 andfan heater 74 dries a solvent at an image formation portion at paper P, which has been separated as a result of dye aggregation, thereby forming a thin film image layer. The temperature of the heated air may vary according to the conveyance speed of paper P, but it is generally set to from around 50Ā°C to around 70Ā°C. - Evaporated solvent may be discharged together with air from an outer portion of
image forming device 10, or the air may be collected, and the air including evaporated solvent may be cooled by a cooling device or the like, and the solvent may be condensed and collected in a liquid state by a radiator or the like. - Paper P, having an image formed at a recording surface thereof, is conveyed to image fixing
section 20 by the rotation ofintermediate conveyance drum 34. - An
image fixing drum 40 is rotatably provided atimage fixing section 20.Image fixing section 20 has a function whereby it imparts heat and pressure to latex particles in the thin film image layer formed on paper P such that the latex particles are melted and thereby fixed on paper P. - At an upper portion of
image fixing drum 40 near to a surface ofimage fixing drum 40 is provided aheat roller 78.Heat roller 78 includes a halogen lamp inside a metal tube made of a material with good heat conductivity, such as aluminum. Heat energy at or above a temperature Tg (melting temperature) of the latex is applied byheat roller 78. As a result, the latex particles melt, and are pressed and fixed into surface irregularities on paper P; thereby, irregularities at an image surface may be smoothed, and glossiness may be improved. - At a downstream side of
heat roller 78 is provided a fixingroller 80. Fixingroller 80 is provided to push against a surface ofimage fixing drum 40, such that a nipping force may be obtained between fixingroller 80 andimage fixing drum 40. To this end, a surface of at least one of fixingroller 80 orimage fixing drum 40 has elasticity, and is configured to have a uniform nip width with respect to paper P. - After the above processes, paper P, having an image fixed at a recording surface thereof is conveyed by the rotation of
image fixing drum 40 to anejection section 21 provided at a downstream side ofimage fixing section 20. - In the present embodiment,
image fixing section 20 has been described. However, a configuration in which an image formed at a recording surface is dried and fixed atdryer 38 is also possible, andimage fixing section 20 is not essential. - The image forming device according to the present embodiment, as shown enlarged in
Figs. 2 and3 , is provided with a structure around a dryer and head unit. - As shown in
Figs. 2 and3 ,head unit 66 is provided with a blockingmember 92 at a conveyance direction upstream side, and a blockingmember 90 at a conveyance direction downstream side. Blockingmember 92 and blockingmember 90 are each provided radially extending from an area near an outer peripheral surface ofimage formation drum 36 that holds conveys paperP. Blocking member 92 and blockingmember 90 each extend in a width direction of paper P, and respectively coverhead unit 66 at both conveyance direction sides thereof. - As shown in
Fig. 3 , an end at a side of blockingmember 92 nearimage formation drum 36, which is provided at a conveyance direction upstream side, is separated from the outer peripheral surface ofimage formation drum 36 only bydistance 92d. Between blockingmember 92 and aninkjet line head 64M which is farthest towards a conveyance direction upstream side is provided afan 94A. -
Fan 94A, as shown by arrow 94F1, blows air along a droplet ejection direction towards an area near an outer peripheral surface ofimage formation drum 36, such that heat fromimage formation drum 36 is not readily transferred to a distal end in an ejection direction ofinkjet line head 64M. - A distal end in an ejection direction of
inkjet line head 64M may be provided with atemperature sensor 96A. A temperature sensed attemperature sensor 96A may be sent as temperature data to a control section (not shown), and based on the temperature data, the control section may controlfan 94A to be ON or OFF such that a temperature at an area near a distal end in an ejection direction ofinkjet line head 64M does not exceed a predetermined temperature. - A
fan 94B is provided at a conveyance direction downstream side ofinkjet line head 64M, and blows air in the direction of arrow 94F2, along a liquid droplet ejection direction towards a vicinity of an outer peripheral surface ofimage formation drum 36. This configuration is such that heat fromimage formation drum 36 is not readily transmitted to a distal end in an ejection direction ofinkjet line head 64M andinkjet line head 64K, which is adjacent thereto on a conveyance direction downstream side thereof. - A distal end in an ejection direction of
inkjet line head 64K may be provided with atemperature sensor 96B similar toinkjet line head 64M. Based on temperature data obtained bytemperature sensor 96B, a control section (not shown) may controlfan 94B to be ON or OFF such that a temperature at an area near a distal end in an ejection direction ofinkjet line head 64K does not exceed a predetermined temperature. Alternatively, in addition to temperature data fromtemperature sensor 96B, a configuration may be adopted in which, for example, temperature data is compared with temperature data from theadjacent temperature sensor 96A, andfan 94B is controlled taking into account the overall temperature ofhead unit 66. - In a similar manner, between
inkjet line head 64K andinkjet line head 64C which is adjacent thereto at a conveyance direction downstream side, is provided afan 94C, and betweeninkjet line head 64C andinkjet line head 64Y which is adjacent thereto at a conveyance direction downstream side is provided afan 94D. - At a conveyance direction downstream side of
inkjet line head 64Y, which is provided furthest at a conveyance direction downstream side, is provided afan 94E, that blows air in the direction of arrow 94F5, along a liquid droplet ejection direction towards a vicinity of an outer peripheral surface ofimage formation drum 36. - At a conveyance direction downstream side of
fan 94E is provided blockingmember 90. Similar to blockingmember 92, blockingmember 90 is provided radially extending from an area near an outer peripheral surface ofimage formation drum 36, and extends across a width direction of paper P, and covershead unit 66 at a conveyance direction downstream side thereof. - An end of blocking
member 90 at a side nearimage formation drum 36 is separated from an outer peripheral surface ofimage formation drum 36 only bydistance 90d. This distance may be substantially the same asdistance 92d from blockingmember 92 to the outer peripheral surface ofimage formation drum 36, ordistance 92d may be smaller thandistance 90d (92d < 90d). - If
distance 92d is smaller thandistance 90d, air readily passes in the direction ofarrow 90F, betweenimage formation drum 36 and blockingmember 90, which is further downstream than blockingmember 92, which is at a conveyance direction upstream side. Thereby, heat fromdryer 38, described below, can be effectively blocked fromhead unit 66. - At a conveyance direction downstream side of blocking
member 90 is provided adryer 38 includingnozzle 72 andfan heater 74. Air blown bynozzle 72 in the direction ofarrow 38F flows along an outer peripheral surface ofimage formation drum 36, and a part thereof passes through a gap (90d) between blockingmember 90 and the outer peripheral surface ofimage formation drum 36 and blows towards ahead unit 66 side. - When an air
flow amount sensor 98 provided at an end of blockingmember 90 near to imageformation drum 36 detects an air flow blowing towards thehead unit 66 side, a control section (not shown) operatesfans 94A to 94E, thereby applying a positive pressure to the gap between blockingmember 90 and blockingmember 92 that is greater than that of the surrounding area, and blows out air in the direction ofarrow 90F. As a result, in this configuration, control is performed such that air carrying heat fromdryer 38 does not enter thehead unit 66 side. -
Dryer 38 may be a blowing device similar tofans 94A to 94E, instead offan heater 74. In this case, air heated by the heatedimage formation drum 36 may be prevented from blowing to ahead unit 66 side through a gap (90d) between blockingmember 90 and an outer peripheral surface ofimage formation drum 36. - The above described
fans 94A to 94E may all be the same type of fan and blow the same amount of air, or different amounts of air may be respectively blown thereby; for example, the amount of air blown may increase from a conveyance direction upstream side to a conveyance direction downstream side. - In other words, by applying a greater positive pressure to an area in the vicinity of
head unit 66 than that at a conveyance direction upstream side, air is more readily blown in the direction ofarrow 90F, and due to air blowing along a conveyance direction, a surface of paper P that has been heated by heat fromimage formation drum 36 may be cooled. - As shown in
Fig. 3 , at an outer peripheral surface ofimage formation drum 36, is provided holdingmember 32 that holds paper P by gripping a leading end portion of paper P, and paper P is conveyed towards a downstream side via holdingmember 32. - Holding
member 32 is provided with a recessedportion 32A provided at an outer peripheral surface ofimage formation drum 36, and acover 33 that covers recessedportion 32A and forms an integrated surface withimage formation drum 36. Due to cover 33 sealing recessedportion 32A, recessedportion 32A is prevented from holding and retaining air which has been heated byimage formation drum 36, whereby heat may be prevented from being transmitted to an area in the vicinity ofhead unit 66. - As shown in
Figs. 4A and 4B , the overall configuration of the image forming device of the present invention according to the present embodiment may be comparatively small, compared to a case in which the present configuration is not adopted. - That is, a conventional
image forming device 100 as shown inFig. 4A provides a separate device as a section corresponding todryer 38 in the present embodiment of the present invention (see arrow 102), and as a result the size thereof in the conveyance direction increases to the length shown byarrow 102. - In contrast, since in
image forming device 10 shown inFig. 4B according to the present embodiment of the present invention, paper P is dried bydryer 38, there is no need to provide a section corresponding toarrow 102 of the conventional art shown inFig. 4A , and it is therefore possible to reduce the overall size of the device. - Although the above describes an embodiment of the present invention, the present invention is not limited to the above-described embodiment, and may be implemented in various embodiments provided that these embodiments do not depart from the appended claims.
- For example, in the above embodiment, paper P is held at a surface of a drum and conveyed. However, the present invention is not limited to this embodiment, and, for example, a configuration that uses an endless belt as a conveyer belt, or a configuration in which a paper is conveyed using a flat plate-like stage, may be used in the present invention.
- In the above embodiment, paper P is coated with processing liquid by processing
liquid application section 14, and following a drying process, droplet ejection is performed with respect to paper P byhead unit 66. However, the present invention is not limited to this embodiment, and, for example, a standard ink jet printer may be used in the present invention, in which plain paper is held and conveyed as is, and droplets are directly ejected to the surface thereof, thereby forming an image. - The ejected liquid of the present invention is also not limited to ink, and may, for example, be used to form substrate patterns during etching.
Claims (9)
- An image forming device (10), comprising:a conveyance stage (36) that holds a recording medium (P) at a holding surface and conveys the recording medium (P);a droplet ejection head (64M/K/C/Y) provided opposing the holding surface;a first air blowing device (94A/B/C/D/E) that blows air along a droplet ejection direction of the droplet ejection head (66), anda second air blowing device (74), provided further to a conveyance direction downstream side than the droplet ejection head (64M/K/C/Y) and opposing the holding surface, that blows heated air,further comprising a first blocking member (90), provided along a droplet ejection direction of the droplet ejection head (64M/K/C/Y) and further to a conveyance direction downstream side than the droplet ejection head (64M/K/C/Y), which blocks between the droplet ejection head (64M/K/C/Y) and the second air blowing device (74),characterized in that it further comprises a second blocking member (92) provided along a droplet ejection direction of the droplet ejection head (64M/K/C/Y) and further to a conveyance direction upstream side than the droplet ejection head (64M/K/C/Y), andwherein a distance (90d) between the first blocking member (90) and the holding surface is larger than a distance (92d) between the second blocking member (92) and the holding surface, and/ora control section configured to control the operation of the first air blowing device (94A/B/C/D/E) such that the air pressure at a space near to the holding surface and between the first blocking member (90) and the second blocking member (92) has a positive pressure with respect to an outside of the space.
- The image forming device (10) of claim 1, wherein the first air blowing device (94A/B/C/D/E) is provided between the droplet ejection head (64M/K/C/Y) and the first blocking member (90).
- The image forming device (10) of claim 1, wherein the first air blowing device (94A/B/C/D/E) is provided between the droplet ejection head (64M/K/C/Y) and the second blocking member (92).
- The image forming device (10) of any one of the preceding claims, further comprising:one or more other droplet ejection heads (64M/K/C/Y), adjacent to the droplet ejection head (64M/K/C/Y), and provided in a row along the conveyance direction; andone or more first air blowing devices (94A/B/C/D/E) provided between the droplet ejection heads (64M/K/C/Y).
- The image forming device (10) of any one of the preceding claims, wherein at least one further first air blowing device (94A1B/C/D/E) is provided, and an amount of air blown by a first air blowing device (94A/B/C/D/E) provided at a conveyance direction downstream side is larger than an amount of air blown by a first air blowing device (94A/B/C/D/E) provided at a conveyance direction upstream side.
- The image forming device (10) of any one of the preceding claims, wherein the stage (36) comprises a roller (32) provided with a heating member (37) that heats the holding surface.
- The image forming device (10) of claim 6, wherein a portion of an outer peripheral surface of the roller (32) is formed with a recess (32A), and a cover member (33) is provided that covers the recess (32A).
- The image forming device (10) of any one of the preceding claims, further comprising a temperature sensor (96A/B/C/D) at an area near an ejection opening distal end of the droplet ejection head (64M/K/C/Y), wherein
the operation of the first air blowing device (94A/B/C/D/E) is controlled based on a temperature of the area near an ejection opening distal end of the droplet ejection head (64M/K/C/Y) detected by the temperature sensor (96A/B/C/D). - The image forming device (10) of claim 1 or 2, further comprising an air flow amount sensor (98) near an end of the first blocking member (90) that is near to the holding surface, wherein
the operation of the first air blowing device (94A/B/C/D/E) is controlled based on an air flow direction (90F) detected by the air flow amount sensor (98).
Applications Claiming Priority (1)
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JP2009055462A JP5230490B2 (en) | 2009-03-09 | 2009-03-09 | Image forming apparatus |
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EP2228222A1 EP2228222A1 (en) | 2010-09-15 |
EP2228222B1 true EP2228222B1 (en) | 2012-05-09 |
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EP10002253A Not-in-force EP2228222B1 (en) | 2009-03-09 | 2010-03-04 | Image forming device |
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EP (1) | EP2228222B1 (en) |
JP (1) | JP5230490B2 (en) |
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GB201401173D0 (en) | 2013-09-11 | 2014-03-12 | Landa Corp Ltd | Ink formulations and film constructions thereof |
JP2015116797A (en) * | 2013-12-20 | 2015-06-25 | ć»ć¤ć³ć¼ćØćć½ć³ę Ŗå¼ä¼ē¤¾ | Recording device |
US9616681B2 (en) | 2014-10-10 | 2017-04-11 | Ricoh Company, Ltd. | Image forming apparatus and drying device for image forming apparatus |
JP6708821B2 (en) | 2015-03-11 | 2020-06-10 | ę Ŗå¼ä¼ē¤¾ćŖć³ć¼ | Image forming apparatus, image forming program, and image forming method |
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JP6944801B2 (en) * | 2017-03-29 | 2021-10-06 | ę Ŗå¼ä¼ē¤¾ļ¼³ļ½ļ½ļ½ ļ½ ļ½ćć¼ć«ćć£ć³ć°ć¹ | Heat roller and printing equipment equipped with it |
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ATE556859T1 (en) | 2012-05-15 |
US20100225695A1 (en) | 2010-09-09 |
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